cyclopentadienyl

noun

The univalent anion derived from cyclopentadiene; contains a ring of delocalized electrons; forms metallocene compounds with transition metals.

OriginAncient Greek ῡ̔́λη (hū́lē) ← Proto-Indo-European *swel-der.? ← English cyclopentadiene →
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Meanings

nouncyclopentadienyl (plural cyclopentadienyls)

plural cyclopentadienyls

  1. chemistryThe univalent anion derived from cyclopentadiene; contains a ring of delocalized electrons; forms metallocene compounds with transition metals.

Origin

  1. Englishcyclopentadiene
  2. Proto-Indo-European*swel-der.?
  3. Ancient Greekῡ̔́λη (hū́lē)
  4. Englishcyclopentadienyl

From cyclopentadiene + -yl.

Full word history & related roots →
Cite this entry
APA

cyclopentadienyl. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/cyclopentadienyl

MLA

“cyclopentadienyl.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/cyclopentadienyl. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “cyclopentadienyl,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/cyclopentadienyl.

Source: cyclopentadienyl on Wiktionary, CC BY-SA 4.0.